Publisher's Synopsis
Excerpt from Type Ammonites VII, Vol. 7
The order now given would appear to be the biological order of the three forms. D. Dichotomum reaches a diameter of 173 mm. Without Showing any Sign of the old-age character, large ribs, or even of ribs set more distantly - a preliminary to the stage of big ribs. D. Strumatum shows wider spacing and enlargement of ribs at about 160 mm. Diameter, a huge-rib stage from about 190 to 230 mm. And a stage of distant, but not so gross ribs afterwards: D. Variocostatum passes over to the distant ribbed stage at about 180 mm. Diam.; but the subsequent enlarged ribs are of low elevation comparable with the ribs of D. Strumatum, as if the gross-ribbed stage had been altogether skipped and there had been direct passage to the less swollen rib-stage of D. Strumatum.
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